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DelCommentsInJava.java
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/*
* ______ ______ ______
* /\ __ \ /\ ___\ /\ ___\
* \ \ __< \ \ __\_ \ \ __\_
* \ \_____\ \ \_____\ \ \_____\
* \/_____/ \/_____/ \/_____/
*
*
* Copyright (c) 2013-2014, {Bee} open source community
* http://www.bee-framework.com
*
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
/**
* @author Insunny
*
*/
public class DelCommentsInJava {
private static final char MARK = '"';
private static final char SLASH = '/';
private static final char BACKSLASH = '\\';
private static final char STAR = '*';
private static final char NEWLINE = '\n';
//引号
private static final int TYPE_MARK = 1;
//斜杠
private static final int TYPE_SLASH = 2;
//反斜杠
private static final int TYPE_BACKSLASH = 3;
//星号
private static final int TYPE_STAR = 4;
// 双斜杠类型的注释
private static final int TYPE_DSLASH = 5;
/**
* 删除char[]数组中_start位置到_end位置的元素
*
* @param _target
* @param _start
* @param _end
* @return
*/
public static char[] del(char[] _target, int _start, int _end) {
char[] tmp = new char[_target.length - (_end - _start + 1)];
System.arraycopy(_target, 0, tmp, 0, _start);
System.arraycopy(_target, _end + 1, tmp, _start, _target.length - _end
- 1);
return tmp;
}
/**
* 删除代码中的注释
*
* @param _target
* @return
*/
public static String delComments(String _target) {
int preType = 0;
int mark = -1, cur = -1, token = -1;
// 输入字符串
char[] input = _target.toCharArray();
for (cur = 0; cur < input.length; cur++) {
String outStr = new String(input);
String temp = outStr.substring(cur);
if (input[cur] == MARK) {
// 首先判断是否为转义引号
if (preType == TYPE_BACKSLASH)
continue;
// 已经进入引号之内
if (mark > 0) {
// 引号结束
mark = -1;
} else {
mark = cur;
}
if(preType != TYPE_DSLASH)
{
preType = TYPE_MARK;
}
} else if (input[cur] == SLASH) {
// 当前位置处于引号之中
if (mark > 0)
continue;
// 如果前一位是*，则进行删除操作
if (preType == TYPE_STAR) {
input = del(input, token, cur);
// 退回一个位置进行处理
cur = token - 1;
preType = 0;
} else if (preType == TYPE_SLASH)
{
token = cur - 1;
preType = TYPE_DSLASH;
}
else if (preType == TYPE_DSLASH)
{
continue;
}
else
{
preType = TYPE_SLASH;
}
}
else if (input[cur] == BACKSLASH)
{
if (preType != TYPE_DSLASH)
{
preType = TYPE_BACKSLASH;
}
else
{
continue;
}
} else if (input[cur] == STAR) {
// 当前位置处于引号之中
if (mark > 0)
continue;
// 如果前一个位置是/,则记录注释开始的位置
if (preType == TYPE_SLASH) {
token = cur - 1;
}
preType = TYPE_STAR;
} else if(input[cur] == NEWLINE)
{
if(preType == TYPE_DSLASH)
{
input = del(input, token, cur);
// 退回一个位置进行处理
cur = token - 1;
preType = 0;
}
}
}
return new String(input);
}
}